This is a minute scavenger beetle sometimes called a mould beetle, and measures 1.5 to 2 mm in length. Colour when mature is dull black and the mature specimens have a waxy membrane to the sides of the pronotum and on various parts of the ventral surface. Younger specimens may be browner than mature adults.
Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.
Various habitats including in fungi, grass tussocks and litter. They tend to avoid very dry areas.
Adults occur all year round.
Widespread and fairly frequent in England and Wales.
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015